Multi-Tone Pound-Drever-Hall Technique for High-Resolution Multiplexed Fabry-Perot Resonator Sensors

摘要

High-finesse fiber Fabry-Perot resonators (FFPR) are widely used in ultrahigh-resolution sensing applications, but the multiplexing of FFPR sensors remains a challenge. This article proposes a novel frequency division multiplexing scheme for highresolution FFPR sensor networks. An optical frequency comb is adopted as the interrogation laser. Via combining the optical frequency comb and the pound-drever-hall (PDH) technique, multitone PDH technique is firstly proposed, and it exhibits advantages of high resolution, powerful multiplexing ability, and system flexibility. It is employed for multiplexed strain sensing with two FFPR sensors. Strain resolution of 3 pe/v Hz at 1 kHz and channel crosstalk of <-80 dB have been realized.